Abstract

The present invention provides A magnesium oxide whisker in-situ formed MA spinel-reinforced magnesium oxide-based ceramic foam filter and a method for preparing the same. The method comprising: 1) preparing a ceramic slurry having a solid content of 60%-70% by dosing 15%-25% by mass of a nanometer alumina sol, 0.8%-1.5% by mass of a rheological agent, and the balance magnesium oxide ceramic powder comprising magnesium oxide whiskers, and then adding deionized water and ball milling to mix until uniform, and then vacuum degassing the mixture; 2) soaking a polyurethane foam template into the ceramic slurry, squeezing by a roller press the polyurethane foam template to remove redundant slurry therein to make a biscuit, and drying the biscuit by heating it to 80° C.-1200° C.; 3) putting the dried biscuit into a sintering furnace, elevating the temperature to 1400° C.-1600° C. and performing a high temperature sintering, cooling to the room temperature with the furnace to obtain the magnesium oxide-based ceramic foam filter.

IPC Classes  ?

• C04B 35/053 - Fine ceramics
• B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
• C04B 35/04 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
• C04B 35/80 - Fibres, filaments, whiskers, platelets, or the like

Abstract

A spinel-reinforced magnesium oxide-based foam ceramic filter that is obtained by coating onto a polyurethane foam carrier a slurry of light calcined magnesium oxide-based ceramic comprising a nanometer lanthanum oxide sintering aid, and then drying and sintering. A method for preparing the foam ceramic filter comprising: 1) preparing a ceramic slurry having a solid content of 60%-70% by dosing 15%-25% by mass of a nanometer alumina sol, 0.8%-1.5% by mass of a rheological agent, and the balance magnesium oxide ceramic powder comprising a nanometer lanthanum oxide sintering aid, and then adding absolute ethanol and ball milling to mix until uniform; 2) soaking a polyurethane foam template into the ceramic slurry, squeezing by a roller press the polyurethane foam template to remove redundant slurry therein to make a biscuit, and then removing the ethanol solvent in a ventilation chamber at a temperature of 40° C.-50° C. to dry the biscuit; 3) putting the dried biscuit into a sintering furnace, elevating the temperature to 1350° C.-1550° C. and performing a high temperature sintering, cooling to the room temperature with the furnace to obtain the magnesium oxide-based ceramic foam filter.

IPC Classes  ?

• C04B 35/626 - Preparing or treating the powders individually or as batches
• B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
• C04B 35/053 - Fine ceramics
• C04B 38/06 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by burning-out added substances

Abstract

Disclosed are a magnesium aluminate spinel reinforced magnesium oxide-based foam ceramic filter synthesized in situ from a magnesium oxide whisker, and a preparation method therefor. The method comprises the following steps: (1) compounding 15%-25% of a nano aluminum sol, 0.8%-1.5% of a rheological agent, and the balance of a magnesium oxide ceramic powder containing a magnesium oxide whisker in a mass percentage, adding deionized water, and mixing same until uniform via ball milling, and then preparing a ceramic slurry with a solid content of 60%-70% by vacuum degassing; (2) dipping a polyurethane foam plastic template into the ceramic slurry, squeezing the polyurethane foam plastic template via a roller press to remove redundant immerging slurry so as to prepare a biscuit, and then heating the biscuit to 80ºC-120ºC for drying; and (3) placing the dried biscuit into a sintering furnace, heating same up to a temperature of 1400ºC-1600ºC for high temperature sintering, and cooling same to room temperature along with the furnace so as to obtain the magnesium oxide-based foam ceramic filter.

IPC Classes  ?

• C04B 35/66 - Monolithic refractories or refractory mortars, including those whether or not containing clay
• C04B 35/04 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
• C04B 38/06 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by burning-out added substances

Abstract

A spinel-reinforced magnesium oxide-based foam ceramic filter, which is obtained by coating a light-burned magnesium oxide-based ceramic slurry containing a nano lanthanum oxide sintering aid on a polyurethane foam carrier, then drying and sintering same. The preparation method for the foam ceramic filter comprises the following steps: (1) according to mass percentage, mixing 15%-25% of nano alumina sol and 0.8%-1.5% of a rheological agent, the rest being magnesium oxide ceramic powder containing a nano lanthanum oxide sintering aid, adding anhydrous ethanol, mixing well by means of ball milling, and obtaining a ceramic slurry having a solid content of 60%-70%; (2) immersing a polyurethane foamed plastic template in the ceramic slurry, pressing the polyurethane foamed plastic template by means of a rolling machine to remove excess immersion slurry, then forming a biscuit, and removing the ethanol solvent in a ventilation chamber at 40°C-50°C to dry the biscuit; (3) placing the dried biscuit in a sintering furnace, raising the temperature to 1350°C-1550°C for high-temperature sintering, and cooling to room temperature in the furnace to obtain a magnesium oxide-based foam ceramic filter.

IPC Classes  ?

• C04B 35/04 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
• C04B 35/66 - Monolithic refractories or refractory mortars, including those whether or not containing clay
• C04B 38/06 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by burning-out added substances

Abstract

244 composite spinel reinforced magnesium oxide-based foam ceramic filter and a preparation method therefor. The method comprises the following steps: (1) mixing 15% to 25% nano aluminum sol, 0.8% to 1.5% rheology agent, and the balance of magnesium oxide ceramic powder material containing a nano chromic oxide sintering auxiliary according to the mass percentage, adding anhydrous ethanol, and ball milling and mixing uniformly to form a ceramic slurry having a solid content of 60% to 70%; (2) immersing a polyurethane foam plastic template into the ceramic slurry, removing the superfluous immersion slurry by extruding the polyurethane foam plastic template by means of a roller pressing machine to prepare a biscuit, and then removing the ethanol solvent in a ventilation chamber at 40°C to 50°C to dry the biscuit; and (3) placing the dried biscuit in a sintering furnace, raising the temperature to a temperature of 1350°C to 1550°C to perform high-temperature sintering, and cooling same with the furnace to room temperature so as to obtain a magnesium oxide-based foam ceramic filter.

IPC Classes  ?

• C04B 35/04 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
• C22B 9/02 - Refining by liquating, filtering, centrifuging, distilling or supersonic wave action
• C04B 38/06 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by burning-out added substances
• C04B 35/634 - Polymers
• C04B 35/636 - Polysaccharides or derivatives thereof
• B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires

Abstract

An aluminum oxide short fiber-reinforced magnesium oxide-based foam ceramic filter, which is obtained by coating a light-burned magnesium oxide-based ceramic slurry containing aluminum oxide short fiber and nano titanium oxide on a polyurethane foam carrier, and drying and sintering same. The preparation method for the foam ceramic filter comprises the following steps: (1) according to mass percentage, mixing 15%-25% of nano alumina sol and 0.8%-1.5% of a rheological agent, the rest being magnesium oxide ceramic powder containing aluminum oxide short fiber and nano titanium oxide, adding anhydrous ethanol, mixing well by means of ball milling, and then preparing a ceramic slurry having a solid content of 60%-70%; (2) immersing a polyurethane foamed plastic template into the ceramic slurry, pressing the polyurethane foamed plastic template by means of a rolling machine to remove excess immersion slurry, then preparing a biscuit, next removing the ethanol solvent in a ventilating chamber at 40°C-50°C to dry the biscuit; (3) placing the dried biscuit in a sintering furnace, raising the temperature to 1350°C-1550°C for high-temperature sintering, and cooling to room temperature in the furnace to obtain a magnesium oxide-based foam ceramic filter.

IPC Classes  ?

• C04B 35/04 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
• C04B 35/80 - Fibres, filaments, whiskers, platelets, or the like
• C04B 38/06 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by burning-out added substances